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BorderedTableLayoutPanel Class

Represents a bordered panel that dynamically lays out its contents in a grid with rows and columns.

Inheritance Hierarchy

System.Object
  System.MarshalByRefObject
    System.ComponentModel.Component
      System.Windows.Forms.Control
        System.Windows.Forms.ScrollableControl
          System.Windows.Forms.Panel
            System.Windows.Forms.TableLayoutPanel
              Microsoft.SqlServer.Management.Controls.BorderedTableLayoutPanel

Namespace:  Microsoft.SqlServer.Management.Controls
Assembly:  Microsoft.SqlServer.Management.Controls (in Microsoft.SqlServer.Management.Controls.dll)

Syntax

'Declaration
Public Class BorderedTableLayoutPanel _
    Inherits TableLayoutPanel
'Usage
Dim instance As BorderedTableLayoutPanel
public class BorderedTableLayoutPanel : TableLayoutPanel
public ref class BorderedTableLayoutPanel : public TableLayoutPanel
type BorderedTableLayoutPanel =  
    class
        inherit TableLayoutPanel
    end
public class BorderedTableLayoutPanel extends TableLayoutPanel

The BorderedTableLayoutPanel type exposes the following members.

Constructors

  Name Description
Public method BorderedTableLayoutPanel Initializes a new instance of the BorderedTableLayoutPanel class.

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Properties

  Name Description
Public property AccessibilityObject (Inherited from Control.)
Public property AccessibleDefaultActionDescription (Inherited from Control.)
Public property AccessibleDescription (Inherited from Control.)
Public property AccessibleName (Inherited from Control.)
Public property AccessibleRole (Inherited from Control.)
Public property AllowDrop (Inherited from Control.)
Public property Anchor (Inherited from Control.)
Public property AutoScroll (Inherited from ScrollableControl.)
Public property AutoScrollMargin (Inherited from ScrollableControl.)
Public property AutoScrollMinSize (Inherited from ScrollableControl.)
Public property AutoScrollOffset (Inherited from Control.)
Public property AutoScrollPosition (Inherited from ScrollableControl.)
Public property AutoSize (Inherited from Panel.)
Public property AutoSizeMode (Inherited from Panel.)
Public property BackColor (Inherited from Control.)
Public property BackgroundImage (Inherited from Control.)
Public property BackgroundImageLayout (Inherited from Control.)
Public property BindingContext (Inherited from Control.)
Public property BorderStyle (Inherited from TableLayoutPanel.)
Public property Bottom (Inherited from Control.)
Public property Bounds (Inherited from Control.)
Protected property CanEnableIme (Inherited from Control.)
Public property CanFocus (Inherited from Control.)
Protected property CanRaiseEvents (Inherited from Control.)
Public property CanSelect (Inherited from Control.)
Public property Capture (Inherited from Control.)
Public property CausesValidation (Inherited from Control.)
Public property CellBorderStyle (Inherited from TableLayoutPanel.)
Public property ClientRectangle (Inherited from Control.)
Public property ClientSize (Inherited from Control.)
Public property ColumnCount (Inherited from TableLayoutPanel.)
Public property ColumnStyles (Inherited from TableLayoutPanel.)
Public property CompanyName (Inherited from Control.)
Public property Container (Inherited from Component.)
Public property ContainsFocus (Inherited from Control.)
Public property ContextMenu (Inherited from Control.)
Public property ContextMenuStrip (Inherited from Control.)
Public property Controls (Inherited from TableLayoutPanel.)
Public property Created (Inherited from Control.)
Protected property CreateParams (Inherited from Panel.)
Public property Cursor (Inherited from Control.)
Public property DataBindings (Inherited from Control.)
Protected property DefaultCursor (Inherited from Control.)
Protected property DefaultImeMode (Inherited from Control.)
Protected property DefaultMargin (Inherited from Control.)
Protected property DefaultMaximumSize (Inherited from Control.)
Protected property DefaultMinimumSize (Inherited from Control.)
Protected property DefaultPadding (Inherited from Control.)
Protected property DefaultSize (Inherited from Panel.)
Protected property DesignMode (Inherited from Component.)
Public property DisplayRectangle (Inherited from ScrollableControl.)
Public property Disposing (Inherited from Control.)
Public property Dock (Inherited from Control.)
Public property DockPadding (Inherited from ScrollableControl.)
Protected property DoubleBuffered (Inherited from Control.)
Public property Enabled (Inherited from Control.)
Protected property Events (Inherited from Component.)
Public property Focused (Inherited from Control.)
Public property Font (Inherited from Control.)
Protected property FontHeight (Inherited from Control.)
Public property ForeColor (Inherited from Control.)
Public property GrowStyle (Inherited from TableLayoutPanel.)
Public property Handle (Inherited from Control.)
Public property HasChildren (Inherited from Control.)
Public property Height (Inherited from Control.)
Public property HorizontalScroll (Inherited from ScrollableControl.)
Protected property HScroll (Inherited from ScrollableControl.)
Public property ImeMode (Inherited from Control.)
Protected property ImeModeBase (Inherited from Control.)
Public property InvokeRequired (Inherited from Control.)
Public property IsAccessible (Inherited from Control.)
Public property IsDisposed (Inherited from Control.)
Public property IsHandleCreated (Inherited from Control.)
Public property IsMirrored (Inherited from Control.)
Public property LayoutEngine (Inherited from TableLayoutPanel.)
Public property LayoutSettings (Inherited from TableLayoutPanel.)
Public property Left (Inherited from Control.)
Public property Location (Inherited from Control.)
Public property Margin (Inherited from Control.)
Public property MaximumSize (Inherited from Control.)
Public property MinimumSize (Inherited from Control.)
Public property Name (Inherited from Control.)
Public property Padding (Inherited from Control.)
Public property Parent (Inherited from Control.)
Public property PreferredSize (Inherited from Control.)
Public property ProductName (Inherited from Control.)
Public property ProductVersion (Inherited from Control.)
Public property RecreatingHandle (Inherited from Control.)
Public property Region (Inherited from Control.)
Protected property RenderRightToLeft Obsolete. (Inherited from Control.)
Protected property ResizeRedraw (Inherited from Control.)
Public property Right (Inherited from Control.)
Public property RightToLeft (Inherited from Control.)
Public property RowCount (Inherited from TableLayoutPanel.)
Public property RowStyles (Inherited from TableLayoutPanel.)
Protected property ScaleChildren (Inherited from Control.)
Protected property ShowFocusCues (Inherited from Control.)
Protected property ShowKeyboardCues (Inherited from Control.)
Public property Site (Inherited from Control.)
Public property Size (Inherited from Control.)
Public property TabIndex (Inherited from Control.)
Public property TabStop (Inherited from Panel.)
Public property Tag (Inherited from Control.)
Public property Text (Inherited from Panel.)
Public property Top (Inherited from Control.)
Public property TopLevelControl (Inherited from Control.)
Public property UseWaitCursor (Inherited from Control.)
Public property VerticalScroll (Inherited from ScrollableControl.)
Public property Visible (Inherited from Control.)
Protected property VScroll (Inherited from ScrollableControl.)
Public property Width (Inherited from Control.)
Public property WindowTarget (Inherited from Control.)

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Methods

  Name Description
Protected method AccessibilityNotifyClients(AccessibleEvents, Int32) (Inherited from Control.)
Protected method AccessibilityNotifyClients(AccessibleEvents, Int32, Int32) (Inherited from Control.)
Protected method AdjustFormScrollbars (Inherited from ScrollableControl.)
Public method BeginInvoke(Delegate) (Inherited from Control.)
Public method BeginInvoke(Delegate, array<Object[]) (Inherited from Control.)
Public method BringToFront (Inherited from Control.)
Public method Contains (Inherited from Control.)
Protected method CreateAccessibilityInstance (Inherited from Control.)
Public method CreateControl (Inherited from Control.)
Protected method CreateControlsInstance (Inherited from TableLayoutPanel.)
Public method CreateGraphics (Inherited from Control.)
Protected method CreateHandle (Inherited from Control.)
Public method CreateObjRef (Inherited from MarshalByRefObject.)
Protected method DefWndProc (Inherited from Control.)
Protected method DestroyHandle (Inherited from Control.)
Public method Dispose() (Inherited from Component.)
Protected method Dispose(Boolean) (Inherited from Control.)
Public method DoDragDrop (Inherited from Control.)
Public method DrawToBitmap (Inherited from Control.)
Public method EndInvoke (Inherited from Control.)
Public method Equals (Inherited from Object.)
Protected method Finalize (Inherited from Component.)
Public method FindForm (Inherited from Control.)
Public method Focus (Inherited from Control.)
Protected method GetAccessibilityObjectById (Inherited from Control.)
Protected method GetAutoSizeMode (Inherited from Control.)
Public method GetCellPosition (Inherited from TableLayoutPanel.)
Public method GetChildAtPoint(Point) (Inherited from Control.)
Public method GetChildAtPoint(Point, GetChildAtPointSkip) (Inherited from Control.)
Public method GetColumn (Inherited from TableLayoutPanel.)
Public method GetColumnSpan (Inherited from TableLayoutPanel.)
Public method GetColumnWidths (Inherited from TableLayoutPanel.)
Public method GetContainerControl (Inherited from Control.)
Public method GetControlFromPosition (Inherited from TableLayoutPanel.)
Public method GetHashCode (Inherited from Object.)
Public method GetLifetimeService (Inherited from MarshalByRefObject.)
Public method GetNextControl (Inherited from Control.)
Public method GetPositionFromControl (Inherited from TableLayoutPanel.)
Public method GetPreferredSize (Inherited from Control.)
Public method GetRow (Inherited from TableLayoutPanel.)
Public method GetRowHeights (Inherited from TableLayoutPanel.)
Public method GetRowSpan (Inherited from TableLayoutPanel.)
Protected method GetScaledBounds (Inherited from Control.)
Protected method GetScrollState (Inherited from ScrollableControl.)
Protected method GetService (Inherited from Component.)
Protected method GetStyle (Inherited from Control.)
Protected method GetTopLevel (Inherited from Control.)
Public method GetType (Inherited from Object.)
Public method Hide (Inherited from Control.)
Public method InitializeLifetimeService (Inherited from MarshalByRefObject.)
Protected method InitLayout (Inherited from Control.)
Public method Invalidate() (Inherited from Control.)
Public method Invalidate(Region) (Inherited from Control.)
Public method Invalidate(Boolean) (Inherited from Control.)
Public method Invalidate(Rectangle) (Inherited from Control.)
Public method Invalidate(Region, Boolean) (Inherited from Control.)
Public method Invalidate(Rectangle, Boolean) (Inherited from Control.)
Public method Invoke(Delegate) (Inherited from Control.)
Public method Invoke(Delegate, array<Object[]) (Inherited from Control.)
Protected method InvokeGotFocus (Inherited from Control.)
Protected method InvokeLostFocus (Inherited from Control.)
Protected method InvokeOnClick (Inherited from Control.)
Protected method InvokePaint (Inherited from Control.)
Protected method InvokePaintBackground (Inherited from Control.)
Protected method IsInputChar (Inherited from Control.)
Protected method IsInputKey (Inherited from Control.)
Protected method MemberwiseClone() (Inherited from Object.)
Protected method MemberwiseClone(Boolean) (Inherited from MarshalByRefObject.)
Protected method NotifyInvalidate (Inherited from Control.)
Protected method OnAutoSizeChanged (Inherited from Control.)
Protected method OnBackColorChanged (Inherited from Control.)
Protected method OnBackgroundImageChanged (Inherited from Control.)
Protected method OnBackgroundImageLayoutChanged (Inherited from Control.)
Protected method OnBindingContextChanged (Inherited from Control.)
Protected method OnCausesValidationChanged (Inherited from Control.)
Protected method OnCellPaint (Inherited from TableLayoutPanel.)
Protected method OnChangeUICues (Inherited from Control.)
Protected method OnClick (Inherited from Control.)
Protected method OnClientSizeChanged (Inherited from Control.)
Protected method OnContextMenuChanged (Inherited from Control.)
Protected method OnContextMenuStripChanged (Inherited from Control.)
Protected method OnControlAdded (Inherited from Control.)
Protected method OnControlRemoved (Inherited from Control.)
Protected method OnCreateControl (Inherited from Control.)
Protected method OnCursorChanged (Inherited from Control.)
Protected method OnDockChanged (Inherited from Control.)
Protected method OnDoubleClick (Inherited from Control.)
Protected method OnDragDrop (Inherited from Control.)
Protected method OnDragEnter (Inherited from Control.)
Protected method OnDragLeave (Inherited from Control.)
Protected method OnDragOver (Inherited from Control.)
Protected method OnEnabledChanged (Inherited from Control.)
Protected method OnEnter (Inherited from Control.)
Protected method OnFontChanged (Inherited from Control.)
Protected method OnForeColorChanged (Inherited from Control.)
Protected method OnGiveFeedback (Inherited from Control.)
Protected method OnGotFocus (Inherited from Control.)
Protected method OnHandleCreated (Inherited from Control.)
Protected method OnHandleDestroyed (Inherited from Control.)
Protected method OnHelpRequested (Inherited from Control.)
Protected method OnImeModeChanged (Inherited from Control.)
Protected method OnInvalidated (Inherited from Control.)
Protected method OnKeyDown (Inherited from Control.)
Protected method OnKeyPress (Inherited from Control.)
Protected method OnKeyUp (Inherited from Control.)
Protected method OnLayout (Inherited from TableLayoutPanel.)
Protected method OnLeave (Inherited from Control.)
Protected method OnLocationChanged (Inherited from Control.)
Protected method OnLostFocus (Inherited from Control.)
Protected method OnMarginChanged (Inherited from Control.)
Protected method OnMouseCaptureChanged (Inherited from Control.)
Protected method OnMouseClick (Inherited from Control.)
Protected method OnMouseDoubleClick (Inherited from Control.)
Protected method OnMouseDown (Inherited from Control.)
Protected method OnMouseEnter (Inherited from Control.)
Protected method OnMouseHover (Inherited from Control.)
Protected method OnMouseLeave (Inherited from Control.)
Protected method OnMouseMove (Inherited from Control.)
Protected method OnMouseUp (Inherited from Control.)
Protected method OnMouseWheel (Inherited from ScrollableControl.)
Protected method OnMove (Inherited from Control.)
Protected method OnNotifyMessage (Inherited from Control.)
Protected method OnPaddingChanged (Inherited from ScrollableControl.)
Protected method OnPaint Raises the OnPaint event. (Overrides Control.OnPaint(PaintEventArgs).)
Protected method OnPaintBackground (Inherited from TableLayoutPanel.)
Protected method OnParentBackColorChanged (Inherited from Control.)
Protected method OnParentBackgroundImageChanged (Inherited from Control.)
Protected method OnParentBindingContextChanged (Inherited from Control.)
Protected method OnParentChanged (Inherited from Control.)
Protected method OnParentCursorChanged (Inherited from Control.)
Protected method OnParentEnabledChanged (Inherited from Control.)
Protected method OnParentFontChanged (Inherited from Control.)
Protected method OnParentForeColorChanged (Inherited from Control.)
Protected method OnParentRightToLeftChanged (Inherited from Control.)
Protected method OnParentVisibleChanged (Inherited from Control.)
Protected method OnPreviewKeyDown (Inherited from Control.)
Protected method OnPrint (Inherited from Control.)
Protected method OnQueryContinueDrag (Inherited from Control.)
Protected method OnRegionChanged (Inherited from Control.)
Protected method OnResize (Inherited from Panel.)
Protected method OnRightToLeftChanged (Inherited from ScrollableControl.)
Protected method OnScroll (Inherited from ScrollableControl.)
Protected method OnSizeChanged (Inherited from Control.)
Protected method OnStyleChanged (Inherited from Control.)
Protected method OnSystemColorsChanged (Inherited from Control.)
Protected method OnTabIndexChanged (Inherited from Control.)
Protected method OnTabStopChanged (Inherited from Control.)
Protected method OnTextChanged (Inherited from Control.)
Protected method OnValidated (Inherited from Control.)
Protected method OnValidating (Inherited from Control.)
Protected method OnVisibleChanged (Inherited from ScrollableControl.)
Public method PerformLayout() (Inherited from Control.)
Public method PerformLayout(Control, String) (Inherited from Control.)
Public method PointToClient (Inherited from Control.)
Public method PointToScreen (Inherited from Control.)
Public method PreProcessControlMessage (Inherited from Control.)
Public method PreProcessMessage (Inherited from Control.)
Protected method ProcessCmdKey (Inherited from Control.)
Protected method ProcessDialogChar (Inherited from Control.)
Protected method ProcessDialogKey (Inherited from Control.)
Protected method ProcessKeyEventArgs (Inherited from Control.)
Protected method ProcessKeyMessage (Inherited from Control.)
Protected method ProcessKeyPreview (Inherited from Control.)
Protected method ProcessMnemonic (Inherited from Control.)
Protected method RaiseDragEvent (Inherited from Control.)
Protected method RaiseKeyEvent (Inherited from Control.)
Protected method RaiseMouseEvent (Inherited from Control.)
Protected method RaisePaintEvent (Inherited from Control.)
Protected method RecreateHandle (Inherited from Control.)
Public method RectangleToClient (Inherited from Control.)
Public method RectangleToScreen (Inherited from Control.)
Public method Refresh (Inherited from Control.)
Public method ResetBackColor (Inherited from Control.)
Public method ResetBindings (Inherited from Control.)
Public method ResetCursor (Inherited from Control.)
Public method ResetFont (Inherited from Control.)
Public method ResetForeColor (Inherited from Control.)
Public method ResetImeMode (Inherited from Control.)
Protected method ResetMouseEventArgs (Inherited from Control.)
Public method ResetRightToLeft (Inherited from Control.)
Public method ResetText (Inherited from Control.)
Public method ResumeLayout() (Inherited from Control.)
Public method ResumeLayout(Boolean) (Inherited from Control.)
Protected method RtlTranslateAlignment(HorizontalAlignment) (Inherited from Control.)
Protected method RtlTranslateAlignment(LeftRightAlignment) (Inherited from Control.)
Protected method RtlTranslateAlignment(ContentAlignment) (Inherited from Control.)
Protected method RtlTranslateContent (Inherited from Control.)
Protected method RtlTranslateHorizontal (Inherited from Control.)
Protected method RtlTranslateLeftRight (Inherited from Control.)
Public method Scale(Single) Obsolete. (Inherited from Control.)
Public method Scale(SizeF) (Inherited from Control.)
Public method Scale(Single, Single) Obsolete. (Inherited from Control.)
Protected method ScaleControl (Inherited from TableLayoutPanel.)
Protected method ScaleCore (Inherited from TableLayoutPanel.)
Public method ScrollControlIntoView (Inherited from ScrollableControl.)
Protected method ScrollToControl (Inherited from ScrollableControl.)
Public method Select() (Inherited from Control.)
Protected method Select(Boolean, Boolean) (Inherited from Control.)
Public method SelectNextControl (Inherited from Control.)
Public method SendToBack (Inherited from Control.)
Public method SetAutoScrollMargin (Inherited from ScrollableControl.)
Protected method SetAutoSizeMode (Inherited from Control.)
Public method SetBounds(Int32, Int32, Int32, Int32) (Inherited from Control.)
Public method SetBounds(Int32, Int32, Int32, Int32, BoundsSpecified) (Inherited from Control.)
Protected method SetBoundsCore (Inherited from Control.)
Public method SetCellPosition (Inherited from TableLayoutPanel.)
Protected method SetClientSizeCore (Inherited from Control.)
Public method SetColumn (Inherited from TableLayoutPanel.)
Public method SetColumnSpan (Inherited from TableLayoutPanel.)
Protected method SetDisplayRectLocation (Inherited from ScrollableControl.)
Public method SetRow (Inherited from TableLayoutPanel.)
Public method SetRowSpan (Inherited from TableLayoutPanel.)
Protected method SetScrollState (Inherited from ScrollableControl.)
Protected method SetStyle (Inherited from Control.)
Protected method SetTopLevel (Inherited from Control.)
Protected method SetVisibleCore (Inherited from Control.)
Public method Show (Inherited from Control.)
Protected method SizeFromClientSize (Inherited from Control.)
Public method SuspendLayout (Inherited from Control.)
Public method ToString (Inherited from Panel.)
Public method Update (Inherited from Control.)
Protected method UpdateBounds() (Inherited from Control.)
Protected method UpdateBounds(Int32, Int32, Int32, Int32) (Inherited from Control.)
Protected method UpdateBounds(Int32, Int32, Int32, Int32, Int32, Int32) (Inherited from Control.)
Protected method UpdateStyles (Inherited from Control.)
Protected method UpdateZOrder (Inherited from Control.)
Protected method WndProc (Inherited from ScrollableControl.)

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Events

  Name Description
Public event AutoSizeChanged (Inherited from Panel.)
Public event BackColorChanged (Inherited from Control.)
Public event BackgroundImageChanged (Inherited from Control.)
Public event BackgroundImageLayoutChanged (Inherited from Control.)
Public event BindingContextChanged (Inherited from Control.)
Public event CausesValidationChanged (Inherited from Control.)
Public event CellPaint (Inherited from TableLayoutPanel.)
Public event ChangeUICues (Inherited from Control.)
Public event Click (Inherited from Control.)
Public event ClientSizeChanged (Inherited from Control.)
Public event ContextMenuChanged (Inherited from Control.)
Public event ContextMenuStripChanged (Inherited from Control.)
Public event ControlAdded (Inherited from Control.)
Public event ControlRemoved (Inherited from Control.)
Public event CursorChanged (Inherited from Control.)
Public event Disposed (Inherited from Component.)
Public event DockChanged (Inherited from Control.)
Public event DoubleClick (Inherited from Control.)
Public event DragDrop (Inherited from Control.)
Public event DragEnter (Inherited from Control.)
Public event DragLeave (Inherited from Control.)
Public event DragOver (Inherited from Control.)
Public event EnabledChanged (Inherited from Control.)
Public event Enter (Inherited from Control.)
Public event FontChanged (Inherited from Control.)
Public event ForeColorChanged (Inherited from Control.)
Public event GiveFeedback (Inherited from Control.)
Public event GotFocus (Inherited from Control.)
Public event HandleCreated (Inherited from Control.)
Public event HandleDestroyed (Inherited from Control.)
Public event HelpRequested (Inherited from Control.)
Public event ImeModeChanged (Inherited from Control.)
Public event Invalidated (Inherited from Control.)
Public event KeyDown (Inherited from Panel.)
Public event KeyPress (Inherited from Panel.)
Public event KeyUp (Inherited from Panel.)
Public event Layout (Inherited from Control.)
Public event Leave (Inherited from Control.)
Public event LocationChanged (Inherited from Control.)
Public event LostFocus (Inherited from Control.)
Public event MarginChanged (Inherited from Control.)
Public event MouseCaptureChanged (Inherited from Control.)
Public event MouseClick (Inherited from Control.)
Public event MouseDoubleClick (Inherited from Control.)
Public event MouseDown (Inherited from Control.)
Public event MouseEnter (Inherited from Control.)
Public event MouseHover (Inherited from Control.)
Public event MouseLeave (Inherited from Control.)
Public event MouseMove (Inherited from Control.)
Public event MouseUp (Inherited from Control.)
Public event MouseWheel (Inherited from Control.)
Public event Move (Inherited from Control.)
Public event PaddingChanged (Inherited from Control.)
Public event Paint (Inherited from Control.)
Public event ParentChanged (Inherited from Control.)
Public event PreviewKeyDown (Inherited from Control.)
Public event QueryAccessibilityHelp (Inherited from Control.)
Public event QueryContinueDrag (Inherited from Control.)
Public event RegionChanged (Inherited from Control.)
Public event Resize (Inherited from Control.)
Public event RightToLeftChanged (Inherited from Control.)
Public event Scroll (Inherited from ScrollableControl.)
Public event SizeChanged (Inherited from Control.)
Public event StyleChanged (Inherited from Control.)
Public event SystemColorsChanged (Inherited from Control.)
Public event TabIndexChanged (Inherited from Control.)
Public event TabStopChanged (Inherited from Control.)
Public event TextChanged (Inherited from Panel.)
Public event Validated (Inherited from Control.)
Public event Validating (Inherited from Control.)
Public event VisibleChanged (Inherited from Control.)

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Explicit Interface Implementations

  Name Description
Explicit interface implemetationPrivate method IExtenderProvider.CanExtend (Inherited from TableLayoutPanel.)
Explicit interface implemetationPrivate method IDropTarget.OnDragDrop (Inherited from Control.)
Explicit interface implemetationPrivate method IDropTarget.OnDragEnter (Inherited from Control.)
Explicit interface implemetationPrivate method IDropTarget.OnDragLeave (Inherited from Control.)
Explicit interface implemetationPrivate method IDropTarget.OnDragOver (Inherited from Control.)

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Thread Safety

Any public static (Shared in Visual Basic) members of this type are thread safe. Any instance members are not guaranteed to be thread safe.